. >>> we have new details tonight about what motivated dzhokhar tsarnaev and his brother tamerlan to allegedly carry out the boston marathon terror attack in which three were killed, more than 260 were injured. now, according to a government official, dzhokhar tsarnaev has said that the war in afghanistan and iraq were the reason that they decided to set off the >> i think it's really premature for them to come to that conclusion or for anyone to come to that conclusion. the evidence has to be examined closely. yes, there is video tape. yes, there are reports that he's made certain statements. but all of that has to be examined by his attorneys. and investigated. >> paul, would you go that far? after all, he has essentially admitted to doing it, and i want to say with a very important caveat, before he was read his miranda rights. >> there's no such thing as a slam dunk in criminal law. but this is as close as you get. you've got video tape putting him at the scene. you have a motive in terms of what he's had to say. plus, you have a guy in a car that admissions were made to. it goes